LED Datasheets Kingbright L53SRC/F Nichia NSPG500S Nichia NSPB500S Nichia NSPW500BS Board Layout The required circuit board is very simple. Depending on the LED and power supply you are using just calculate the required voltage drop on the resistor to bring down the supply voltage to the LED voltage requirement. I connected each coloured LED group in parallel so for example the white Nichia LED requires 3.6V and the 6 LED will draw 20mA each (120mA total). I then used Ohm's Law: V=I*R to calculate the required resistance (R=V/I=(5V-3.6V)/0.12A=11.7Ohms). You probably won't be able to get an exact resistor so just pick a resistance that is higher and necessary to protect the LED. I then added the variable resistor to the loop in series so that one complete loop would have the supply going in, the resistor, the variable resistor, 6 or 12 LED in parallel and the supply going out. A variable resistor of 1kOhms is easily enough to dim the LED from full brightness to darkness. Schematic Board Pattern for Etching